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18-20 Gauge to 16 Gauge wire

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SCPD

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Im running a small light that draws 1.6 amps max. From the switch to the fuse box (car fuse box) im running 18-20 Gauge wire. Near the switch im placing an inline fuse, but the wire gauge on either side of the fuse holder is 16 Gauge.. is it okay to go from 18-20 Gauge wire to 16 Gauge wire? I know not to go from a smaller number gauge to a smaller number wise due to increased resistance... but is the other way around okay? Never had this come up, thanks
 

AB4BF

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You are correct. The smaller number equates to larger diameter wire. 18 gauge, 20 guage wire will carry 1.6 Amps but going to 16 gauge will carry more. *Be sure to fuse the 16 gauge wire appropriately* because it will carry a few more amps.

Consult the latest National Electrical Code for exact amperage of the wire you may be using or get yourself an Ugly's book for quick reference.

Connecting the 16 gauge wire in series with the 18 ga. is not a problem as long as you fuse the 16 gauge low enough so as not to overload the 18 ga. but enough to carry the current to power your light. If it is an automotive type fuse (the colored blade type) you shouldn't use more than a 5 amp fuse. The same goes for an inline AGC type glass barrel fuse - no more than 5 amps.
 
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RobKB1FJR

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I remember gauge simply by 12 Gauge Shells are bigger then 20 gauge shells. I'm not an electrician I'm a nurse and it helps to remember this with needles since they use the gauge as a size.
 

SCPD

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Thanks for all the help! Everything is hooked up and running great. Its just a little LED light, max output by manufactured spec is 1.6 amps. I put in a 2 amp fuse and no problems yet. Ive got spares handy. Thanks again!

Only other issue was that I had to use a ring connector for 14-16 gauge wire on my 18-20 gauge line. Still works fine
 
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